If there's one thing Vivienne Westwood is more passionate about than fashion, it's charity.

At her Red Label fashion show last weekend she wrote a nice letter to her guests urging them to help save the rainforest.

The designer wrote:

"Most of you know that I’ve always used my fashion shows as a platform for my belief in the importance of social justice and the urgent need to fight climate change. Tonight I introduce the Rainforest charity, Cool Earth, and a campaign that is very close to my heart- a plan to save the most vulnerable Rainforest areas by 2020.

We must begin today- tomorrow is too late. Governments have been talking about saving the Rainforest for 40 years. Now, only half of it is left. Since launching in 2007, Cool Earth has worked with indigenous Rainforest people to protect 2.5 million acres in the Western Amazon and block the advance of illegal logging- the first stage in most Rainforest destruction. We plan to extend this effective community-lead model along the most critical arcs of deforestation in the Amazon, the Congo Basin and Borneo- the groundwork has already been laid. We need your help to continue.

I am personally supporting Cool Earth and investing in our future. Tonight marks the start of our fundraising campaign for Cool Earth- we will have the official launch in November. I’m inviting my friends, celebrities and everyone interested in saving our beautiful world to join me. Think about getting involved."